CN1234995C - Method for reconstructing domestic 1025t/h uniflow boileer with single firebox to control loop boiler as well as equipment - Google Patents
Method for reconstructing domestic 1025t/h uniflow boileer with single firebox to control loop boiler as well as equipment Download PDFInfo
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- CN1234995C CN1234995C CN 02145064 CN02145064A CN1234995C CN 1234995 C CN1234995 C CN 1234995C CN 02145064 CN02145064 CN 02145064 CN 02145064 A CN02145064 A CN 02145064A CN 1234995 C CN1234995 C CN 1234995C
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Abstract
The present invention relates to a method for reforming a 1025 t/h home-made single-hearth once-through boiler into a control recirculation boiler, namely reforming the home-made 1025 t/h single-hearth once-through boiler into a control recirculation furnace on the basis of keeping the external dimensions of the original single hearth once-through boiler. The equipment is especially designed for boiler improvement. The equipment comprises a water wall separated lower header tank, a phi 22*5.5 internal thread water wall tube, a mixer, an overheating system, a reheater, a coal economizer and an air preheater. The equipment is characterized in that the equipment omits a once-through water wall system in the original single-hearth once-through boiler and is additionally provided with a water wall circulating system composed of a steam drum, a down-stream tube, a water wall tube, a boiler water circulating pump, a sewage ladle and a throttle for controlling circulation. The equipment has the advantages of enhancing the reliability of the wall and satisfying the requirements of peak load regulation of electric networks; the equipment eliminates the hidden danger that the frequent leakage of the water wall of the original once-through boiler influences powder generating capacity.
Description
Technical field:
The present invention relates to mode and equipment that the single burner hearth direct current of a kind of homemade 1025t/h stove is transformed into the control circulatory stove, be used for the 300MW generating set, belong to the station boiler technical field.
Background technology:
The single burner hearth of the former 1025t/h that matches with the 300MW generating set UP type direct current cooker that once rises, as shown in Figure 4, it comprises that water-cooling wall separates next part case 1, φ 22 * 5.5 internal thread water screen tubes 2, blender 3; Its carbonated drink flow process as shown in Figure 3, promptly feeding water enters the direct current water screen system after economizer heating, once by heating, reached little superheated steam state when being evaporated to the water screen system outlet, be heated to be superheated steam through superheating system again.The characteristics of direct current cooker are that heating, evaporation, overheated heating surface do not have fixedly line of demarcation.
Along with the continuous increase of net capacity, electrical network peak-valley difference contradiction becomes increasingly conspicuous, and needs more unit to participate in peak regulation, and big capacity unit has also been proposed identical requirement.Wish that unit not only can this load of tape base, and can participate in peaking operation.The single burner hearth of the 1025t/h UP type direct current cooker that once rises exists serious defective on performance, in order to guarantee the safety of direct current cooker furnace wall cooling, must guarantee that medium has enough flows and flow velocity in the water screen tube, so water-cooling wall pipe of burner hearth has adopted the very little caliber of φ 22 * 5.5.This tubule footpath water-cooling wall heat sensitivity is very strong, causes the higher and overtemperature of tube wall temperature easily, booster, tubule footpath poor rigidity, easy deformation and damage; In addition, because the water screen tube wall temperature is higher, the water screen tube high temperature corrosion takes place easily; Especially when following, the hydrodynamic force operating mode worsens boiler load less than 80%, the easier generation overtemperature of water-cooling wall, damage, thus make boiler can't participate in peak regulation.
Summary of the invention:
Purpose of the present invention is exactly the single burner hearth direct current of homemade 1025t/h stove to be transformed into the control circulatory stove keeping on original single burner hearth appearance and size basis, make boiler can safety, operation economically, and have good peak modulation capacity.
For realizing above purpose, technical scheme of the present invention provides mode and the equipment that the single burner hearth direct current of a kind of homemade 1025t/h stove is transformed into the control circulatory stove.
A kind of homemade single burner hearth direct current stove provided by the present invention is transformed into the mode of control circulatory stove, and its carbonated drink flow process is:
(1). feedwater enters drum after the economizer heating;
(2). water in drum order enters water bag under the annular of water-cooling wall through down-comer, boiler water circulating pump, by the throttle of water screen tube import department, distribute circulating water flow to each water screen tube (6);
(3). working medium heats in water screen tube and evaporation process;
(4). the steam water interface of water screen tube outlet enter carry out in the drum vapour, moisture from;
(5). isolated water and mix by the feedwater that enters drum after the economizer heating after enter again in the down-comer, form the circulation of stove water;
(6) isolated steam is heated to be superheated steam through superheating system.
The present invention is transformed into the custom-designed equipment of mode of control circulatory stove for homemade single burner hearth direct current stove, comprise water-cooling wall separation next part case, φ 22 * 5.5 internal thread water screen tubes, blender, superheating system, reheater, economizer, air preheater, its characteristics are:
(1). the water-cooling wall of casting out in former single burner hearth direct current cooker is separated former direct current water screen systems such as next part case, φ 22 * 5.5mm internal thread water screen tube, blender;
(2). set up the control recirculated water cooling wall circulatory system that includes drum, down-comer, water screen tube, boiler water circulating pump, following water bag and flow controller:
A. above between boiler A organ timbering and B organ timbering, set up drum, be equipped with water screen tube around the burner hearth, boiler water circulating pump is set up in the below, Xia Shuibao, Xia Shuibao are built-in with throttle, and throttle connects with water screen tube import department, and drum is connected by the major diameter down-comer with boiler water circulating pump;
B. change φ 22 * 5.5mm internal thread water screen tube into φ 45 * 6mm internal thread water screen tube, pitch is amplified.
Boiler has multiple endless form, the principle of various endless form is all inequality, its structural configuration also has bigger difference, therefore, all do not transform endless form at home and abroad in the boiler improvement, be that the transformation of former single burner hearth direct current cooker still keeps the direct current mode, former drum boiler transformation still keeps the endless form of former drum boiler, and the present invention but changes the direct current mode into drum boiler control endless form.
In the control combined-circulation once-through boiler, drum as heating, evaporation and overheated between separation, boiler water circulating pump provides the circulation of stove water required pressure head, this not only makes the periodic duty of stove water safe and reliable, and allow the stove water system that the higher resistance that circulates is arranged, can adopt suitable circulating ratio to increase circulating water flow, therefore can allow to amplify the diameter of water screen tube.Each root water screen tube import department of control combined-circulation once-through boiler is different with the heat absorption of Ge Gen water screen tube according to furnace load, the throttle of different-diameter is housed, regulate and distribute the circulating water flow in each pipe, therefore compare with former single burner hearth direct current cooker, the water-cooling wall hydrodynamic characterisitic of control combined-circulation once-through boiler is more safe and reliable, and make boiler accelerate start and stop speed, and boiler load can be changed fast, satisfy the requirement of peak load regulation network.
Advantage of the present invention is: improved water-cooling wall reliability, satisfy the requirement of peak load regulation network, solved the hidden danger of the frequent leakage contribution generated energy of former direct current stove water-cooling wall, can reduce the loss about 1,400 ten thousand yuan/every after the transformation. year.
Description of drawings:
Fig. 1 is a steam and feed flow diagram after the boiler improvement;
Fig. 2 is improved control combined-circulation once-through boiler structure chart;
Fig. 3 is following water bag and throttle structure chart;
Fig. 4 is former single burner hearth direct current cooker steam and feed flow diagram;
Fig. 5 is former single burner hearth direct current cooker structure chart;
The specific embodiment:
With the 1025t/h of power plant boiler improvement is example:
As shown in Figure 5, be former single burner hearth direct current cooker structure chart, comprise water-cooling wall separation next part case 1, φ 22 * 5.5 internal thread water screen tubes 2, blender 3, superheating system 10, reheater 11, economizer 12, air preheater 13, boiler ∏ type, the open-air layout, burner hearth is wide * and be 13.035m * 12.195m deeply, back cigarette well depth is 12m, and the furnace roof absolute altitude is 58.6m.Water-cooling wall comprises water-cooling wall separation next part case 1, internal thread water screen tube 2, blender 3; φ 22 * 5.5 riffled tubes are adopted in radiation in around the burner hearth, and last radiation is φ 25 * 6 light pipes, and pitch is 35mm.Superheater system is made up of furnace roof superheater, cladding superheater, low temperature superheater, division pendant superheater, pendant superheater, high temperature superheater Pyatyi heating surface and two-stage spray desuperheating device.Desuperheating device is arranged in the port of export of division pendant superheater entrance point and pendant superheater.
As shown in Figure 2, be improved control combined-circulation once-through boiler structure chart, improved boiler is that single burner hearth ∏ type arranges that furnace width is 13.035m, and the degree of depth is 11.838m, and the furnace roof absolute altitude still is 58.6m.
Cast out the former direct current stove direct current water screen system that water-cooling wall separation next part case 1, internal thread water screen tube 2, blender 3 in former single burner hearth direct current cooker are formed;
Set up the control recirculated water cooling wall circulatory system that drum 4, down-comer 5, water screen tube 6, boiler water circulating pump 7, following water bag 8 and throttle 9 are formed:
Above between boiler A organ timbering and B organ timbering, set up drum 4, be equipped with water screen tube 6 around the burner hearth, boiler water circulating pump 7, following water bag 8 are set up in the below, as shown in Figure 3, following water bag 8 is built-in with throttle 9, throttle 9 connects with every water screen tube 6 import departments, and drum 4 is connected by major diameter down-comer 5 with boiler water circulating pump 7;
Adopting pipe φ 45 * 6mm pitch around the burner hearth is the internal thread water screen tube 6 of 57mm.
Improved control combined-circulation once-through boiler, as shown in Figure 1, its carbonated drink flow process is:
(1). feedwater enters drum 4 after the economizer heating;
(2). water in the drum 4 order enters water bag 8 under the annular of water-cooling wall through down-comer 5, boiler water circulating pump 7, by the throttle 9 of water screen tube 6 import departments, distribute circulating water flows to each water screen tube 6;
(3). working medium heats and evaporation process in water screen tube 6;
(4). the steam water interface of water screen tube 6 outlet enter carry out in the drum 4 vapour, moisture from;
(5). isolated water and mix by the feedwater that enters drum 4 after the economizer heating after enter again in the down-comer 5, form the circulation of stove water;
(6). isolated steam is heated to be superheated steam through the superheating system of furnace roof superheater, cladding superheater, low temperature superheater, a loop, secondary circuit division pendant superheater, pendant superheater, high temperature superheater and two-stage spray desuperheating device.
Claims (2)
1. a homemade single burner hearth direct current stove is transformed into the mode of controlling circulatory stove, and its carbonated drink flow process is:
(1). feedwater enters drum (4) after the economizer heating;
(2). water in the drum (4) order enters water bag (8) under the annular of water-cooling wall through down-comer (5), boiler water circulating pump (7), by the throttle (9) of water screen tube import department, distribute circulating water flow to each water screen tube (6);
(3). working medium heats and evaporation process in water screen tube (6);
(4). the steam water interface of water screen tube (6) outlet enter carry out in the drum (4) vapour, moisture from;
(5). isolated water and mix by the feedwater that enters drum (4) after the economizer heating after enter again and form stove water in the down-comer (5) and circulate;
(6). isolated steam is heated to be superheated steam through superheating system.
2. one kind is used the described homemade single burner hearth direct current stove of claim 1 to be transformed into the control mode of circulatory stove and custom-designed equipment, comprise water-cooling wall separation next part case (1), φ 22 * 5.5 internal thread water screen tubes (2), blender (3), superheating system (10), reheater (11), economizer (12), air preheater (13), it is characterized in that:
(1). cast out the direct current water screen system that water-cooling wall in former single burner hearth direct current cooker is separated next part case (1), φ 22 * 5.5 internal thread water screen tubes (2), the former direct current cooker of blender (3);
(2). set up the water-cooling wall circulatory system of the control circulation of drum (4), down-comer (5), water screen tube (6), boiler water circulating pump (7), Xia Shuibao (8) and throttle (9) composition:
A. above between boiler A organ timbering and B organ timbering, set up drum (4), be equipped with water screen tube (6) around the burner hearth, boiler water circulating pump (7) is set up in the below, Xia Shuibao (8), Xia Shuibao (8) are built-in with throttle (9), throttle (9) connects with water screen tube (6) import department, and drum (4) is connected by major diameter down-comer (5) with boiler water circulating pump (7);
B. change φ 22 * 5.5mm internal thread water screen tube (2) into φ 45 * 6mm internal thread water screen tube (6), pitch is amplified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02145064 CN1234995C (en) | 2002-11-06 | 2002-11-06 | Method for reconstructing domestic 1025t/h uniflow boileer with single firebox to control loop boiler as well as equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02145064 CN1234995C (en) | 2002-11-06 | 2002-11-06 | Method for reconstructing domestic 1025t/h uniflow boileer with single firebox to control loop boiler as well as equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1499128A CN1499128A (en) | 2004-05-26 |
| CN1234995C true CN1234995C (en) | 2006-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 02145064 Expired - Lifetime CN1234995C (en) | 2002-11-06 | 2002-11-06 | Method for reconstructing domestic 1025t/h uniflow boileer with single firebox to control loop boiler as well as equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102345855A (en) * | 2011-07-08 | 2012-02-08 | 贵州电力试验研究院 | boiler water pump pollution discharge structure for water storage tank of concurrent boiler |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8230686B2 (en) * | 2008-10-09 | 2012-07-31 | Banas John M | Start-up system mixing sphere |
| JP2010133594A (en) * | 2008-12-03 | 2010-06-17 | Mitsubishi Heavy Ind Ltd | Boiler structure |
| CN104613457A (en) * | 2015-01-29 | 2015-05-13 | 上海上电电力工程有限公司 | Smoke temperature rising system for maintaining normal operation of SCR for direct-flow and natural circulation boilers |
| CN106765028A (en) * | 2017-01-22 | 2017-05-31 | 华北电力科学研究院有限责任公司 | A kind of power plant boiler starts boiler circuit and its start-up and shut-down control method |
| CN112963819A (en) * | 2021-04-16 | 2021-06-15 | 西安热工研究院有限公司 | Steam-water system arrangement structure of deep peak regulation double-hearth power station pulverized coal boiler |
-
2002
- 2002-11-06 CN CN 02145064 patent/CN1234995C/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102345855A (en) * | 2011-07-08 | 2012-02-08 | 贵州电力试验研究院 | boiler water pump pollution discharge structure for water storage tank of concurrent boiler |
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| Publication number | Publication date |
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| CN1499128A (en) | 2004-05-26 |
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Granted publication date: 20060104 |